IOS-ZBARDK-应用程序崩溃，并出现-[UILabel length]：无法识别的选择器发送到实例

当我直接打开相机的QRCode视图时，它崩溃了。但是，当我在QRCode开始时不直接打开相机的视图时，它可以正常工作。我已经在一个空的应用程序中尝试了相同的代码，它工作得非常好。这种情况就是这样发生的。所有iBouts和iBaction都在工作，以下是我的代码：

SerialController.h:

#import <UIKit/UIKit.h>
#import "ZBarSDK.h"

@interface SerialController : UIViewController <ZBarReaderDelegate>

@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *spinner;
@property (weak, nonatomic) IBOutlet UILabel *description;
@property (weak, nonatomic) IBOutlet UIImageView *key;
@property (weak, nonatomic) IBOutlet UILabel *resultText;


@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *qrSearchButton;

@property (weak, nonatomic) IBOutlet UIView *contentHolder;

@property (weak, nonatomic) IBOutlet UIImageView *turkcellLogo;
@property (weak, nonatomic) IBOutlet UIImageView *backgroundImage;
@end

SerialController.m

- (IBAction)handleQrSearchButtonTap:(id)sender {


    ZBarReaderViewController *codeReader = [ZBarReaderViewController new];
    codeReader.readerDelegate=self;
    codeReader.supportedOrientationsMask = ZBarOrientationMaskAll;

    ZBarImageScanner *scanner = codeReader.scanner;
    [scanner setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0];

    [self presentViewController:codeReader animated:YES completion:nil];

}

#pragma mark - ZBar's Delegate method

- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
    //  get the decode results
    id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];

    ZBarSymbol *symbol = nil;
    for(symbol in results)
        // just grab the first barcode
        break;

    // showing the result on textview
    self.resultText.text = symbol.data;



    // dismiss the controller
    [reader dismissViewControllerAnimated:YES completion:nil];
}

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您不想使用名为description的属性。我只是花了几个小时试图解决完全相同的问题。描述是NSObject中的标准方法，您正在隐藏它。将其重命名为其他名称

显示堆栈跟踪的相关部分。不知何故，您有一个UILabel，可用于预期NSString的位置。请检查堆栈跟踪并确定错误的来源。